Which blog URL is better for SEO: blog subdomain or blog subdirectory?
Regularly posting insightful articles to your web site is one of the best ways to attract visitors that can turn into new clients. Most IT companies who publish tips, news and other useful information, post their content on a blog.
There are several factors that influence the rank of your blog articles when people search for related terms on Google. A few years ago, there was a debate in the search engine optimization (SEO) world on whether your blog URL should be:
At the time, the general consensus was that posting articles to a subdirectory, like yourdomain/blog, scored you extra points with Google and that using a subdomain, like blog.yourdomain, reduced your ranking because subdomains can be completely different sites.
However, for the last two years or so, many SEO experts report that both URL formats result in equal traction. They are saying that Google realizes that many companies use blog.yourdomain as the URL for their blogs so it does not penalize their search results rank for using this format. In fact, Google's head of webspam, Matt Cutts, reported in his video blog that Google sees both types of URLs for blogs as the same: see Matt Cutts' video on how URL format affects indexing.
In Google's video, Matt points out that there are many valid reasons to use a subdomain for your blog instead of a subdirectory, such as using other tools to manage your blog, and that they recommend you use whatever is easiest for you. Google says they will index it the same way.
MailerMailer has used the blog.mailermailer.com URL format for our blog since we started it many years ago. It is a highly ranked blog related to email marketing for numerous search terms. So, if your SEO consultant is insisting that you keep your blog on yourdomain.com/blog and that you will not get as much traction by using blog.yourdomain.com, please have them look at the latest tests by other SEO experts — and the comments by Google's head of webspam.
Google changes their algorithms constantly and according to them, the subdomain vs subdirectory debate for blogs isn't a debate any more. Both URL formats are on equal footing.